Multi-disk clutches and synchronizers are used to achieve smooth engagement of spinning parts in automotive transmissions. To test these components, rigs are used that replicate the conditions they would experience in a vehicle, such as high speeds and various loads. Common test rigs are mechanical dynamometers, vibration rigs, and high speed test benches. The rigs measure torque, speed, and power, and can also be used to test for noise and vibration. Additionally, the rigs can be used to measure the behavior of the components under different temperatures and conditions.